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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- /* $Id$ */
-
- package org.apache.fop.render.intermediate;
-
- import javax.xml.transform.OutputKeys;
- import javax.xml.transform.Result;
- import javax.xml.transform.Transformer;
- import javax.xml.transform.TransformerConfigurationException;
- import javax.xml.transform.sax.SAXResult;
- import javax.xml.transform.sax.SAXTransformerFactory;
- import javax.xml.transform.sax.TransformerHandler;
-
- import org.xml.sax.ContentHandler;
-
- import org.apache.fop.util.GenerationHelperContentHandler;
-
- /**
- * Abstract base class for XML-writing {@link IFDocumentHandler} implementations.
- */
- public abstract class AbstractXMLWritingIFDocumentHandler extends AbstractIFDocumentHandler {
-
- /**
- * Default SAXTransformerFactory that can be used by subclasses.
- */
- protected SAXTransformerFactory tFactory
- = (SAXTransformerFactory)SAXTransformerFactory.newInstance();
-
- /** Main SAX ContentHandler to receive the generated SAX events. */
- protected GenerationHelperContentHandler handler;
-
- protected AbstractXMLWritingIFDocumentHandler(IFContext context) {
- super(context);
- }
-
- /** {@inheritDoc} */
- public void setResult(Result result) throws IFException {
- if (result instanceof SAXResult) {
- SAXResult saxResult = (SAXResult)result;
- this.handler = new GenerationHelperContentHandler(
- saxResult.getHandler(), getMainNamespace(), getContext());
- } else {
- this.handler = new GenerationHelperContentHandler(
- createContentHandler(result), getMainNamespace(), getContext());
- }
- }
-
- /**
- * Returns the main namespace used for generated XML content.
- * @return the main namespace
- */
- protected abstract String getMainNamespace();
-
- /**
- * Creates a ContentHandler for the given JAXP Result instance.
- * @param result the JAXP Result instance
- * @return the requested SAX ContentHandler
- * @throws IFException if an error occurs setting up the output
- */
- protected ContentHandler createContentHandler(Result result) throws IFException {
- try {
- TransformerHandler tHandler = tFactory.newTransformerHandler();
- Transformer transformer = tHandler.getTransformer();
- transformer.setOutputProperty(OutputKeys.INDENT, "yes");
- transformer.setOutputProperty(OutputKeys.METHOD, "xml");
- tHandler.setResult(result);
- return tHandler;
- } catch (TransformerConfigurationException tce) {
- throw new IFException(
- "Error while setting up the serializer for XML output", tce);
- }
- }
-
- }
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